//
// aegis - project change supervisor
// Copyright (C) 2005, 2006, 2008, 2014 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

#include <common/ac/zlib.h>

#include <libaegis/adler32.h>
#include <libaegis/input/file.h>


unsigned long
calculate_adler32(const nstring &filename)
{
    input::pointer in = input_file::open(filename);
    uLong check_sum = adler32(0L, Z_NULL, 0);
    for (;;)
    {
        Bytef buf[1024];
        size_t len = in->read(buf, sizeof(buf));
        if (!len)
            break;
        check_sum = adler32(check_sum, buf, len);
    }
    return check_sum;
}


// vim: set ts=8 sw=4 et :